Operating instructions

Functions
7.2 Inverter control
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
185
7.2 Inverter control
If you are controlling the inverter using digital inputs, you use parameter p0015 during basic
commissioning to define how the motor is switched on and off and how it is changed over
from clockwise to counter-clockwise rotation.
Five different methods are available for controlling the motor. Three of the five methods just
require two control commands (two-wire control). The other two methods require three
control commands (three-wire control).
Table 7- 1 Two-wire control and three-wire control
Behavior of the motor
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Control commands Typical
application
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Two-wire control, method 1
1. Switch the motor on and off
(ON/OFF1).
2. Reverse the motor direction of
rotation.
Local control in
conveyor
systems.
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Two-wire control, method 2 and
two-wire control, method 3
1. Switch the motor on and off
(ON/OFF1), clockwise rotation.
2. Switch the motor on and off
(ON/OFF1), counter-clockwise
rotation.
Traction drives
with control via
joystick
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Three-wire control, method 1
1. Issue enable for switching on motor
and switch off motor (OFF1).
2. Switch on motor (ON), clockwise
rotation.
3. Switch on motor (ON), counter-
clockwise rotation.
Traction drives
with control via
joystick
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Three-wire control, method 2
1. Issue enable for switching on motor
and switch off motor (OFF1).
2. Switch on motor (ON).
3. Reverse the motor direction of
rotation.
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